Cheri Casper wrote:
> Some of these "new" conventions are simply
> due to laziness, like the trend to space only once after end-of-sentence
> punctuation. Two lazy to hit the space bar twice.

This one is not actually new-fangled. It has always been the standard to
use a single space after a sentence in typesetting, where fonts are
proportional, and to use a double space when fonts are monospaced (e.g.
Courier). With monospaced fonts, it is hard to read fluently without an
artificial break being created in the typesetting. This is not the case
with proportional fonts, where the spacing is more random, so creating a
space after a sentence isn't necessary. Those who learned to type on a
typewriter were taught to double space after the end of a sentence, but
this was only because typewriter fonts were monospaced, not proportional as
today's computer fonts are.